Piezo Ceramics – How can the Young’s modulus be defined

The stiffness of materials is explained through the young’s modulus which in elastic solids is a material property. During the elongation (Δ L) of a plate or rod of length (L) and cross section (A) due to force (F) the Young’s modulus can written as below:

Y = (L/A)*(F/ΔL)

In the equivalent spring constant of a plate or a rod of material which is in contact with a piezo actuator (F/ΔL), Y is frequently used to estimate it in piezo applications.